7=d-13

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Solution for 7=d-13 equation: 



7=d-13

We move all terms to the left:

7-(d-13)=0

We get rid of parentheses

-d+13+7=0

We add all the numbers together, and all the variables

-1d+20=0

We move all terms containing d to the left, all other terms to the right

-d=-20

d=-20/-1

d=+20

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